1 /* 2 * ipaddrlabel.c "ip addrlabel" 3 * 4 * Copyright (C)2007 USAGI/WIDE Project 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, see <http://www.gnu.org/licenses>. 18 * 19 * 20 * Based on iprule.c. 21 * 22 * Authors: YOSHIFUJI Hideaki <yoshfuji (at) linux-ipv6.org> 23 * 24 */ 25 26 #include <stdio.h> 27 #include <stdlib.h> 28 #include <unistd.h> 29 #include <syslog.h> 30 #include <fcntl.h> 31 #include <sys/socket.h> 32 #include <netinet/in.h> 33 #include <netinet/ip.h> 34 #include <arpa/inet.h> 35 #include <string.h> 36 #include <linux/types.h> 37 #include <linux/if_addrlabel.h> 38 39 #include "rt_names.h" 40 #include "utils.h" 41 #include "ip_common.h" 42 43 #define IFAL_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrlblmsg)))) 44 #define IFAL_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ifaddrlblmsg)) 45 46 extern struct rtnl_handle rth; 47 48 static void usage(void) __attribute__((noreturn)); 49 50 static void usage(void) 51 { 52 fprintf(stderr, "Usage: ip addrlabel [ list | add | del | flush ] prefix PREFIX [ dev DEV ] [ label LABEL ]\n"); 53 exit(-1); 54 } 55 56 int print_addrlabel(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg) 57 { 58 FILE *fp = (FILE*)arg; 59 struct ifaddrlblmsg *ifal = NLMSG_DATA(n); 60 int len = n->nlmsg_len; 61 struct rtattr *tb[IFAL_MAX+1]; 62 char abuf[256]; 63 64 if (n->nlmsg_type != RTM_NEWADDRLABEL && n->nlmsg_type != RTM_DELADDRLABEL) 65 return 0; 66 67 len -= NLMSG_LENGTH(sizeof(*ifal)); 68 if (len < 0) 69 return -1; 70 71 parse_rtattr(tb, IFAL_MAX, IFAL_RTA(ifal), len); 72 73 if (n->nlmsg_type == RTM_DELADDRLABEL) 74 fprintf(fp, "Deleted "); 75 76 if (tb[IFAL_ADDRESS]) { 77 fprintf(fp, "prefix %s/%u ", 78 format_host(ifal->ifal_family, 79 RTA_PAYLOAD(tb[IFAL_ADDRESS]), 80 RTA_DATA(tb[IFAL_ADDRESS]), 81 abuf, sizeof(abuf)), 82 ifal->ifal_prefixlen); 83 } 84 85 if (ifal->ifal_index) 86 fprintf(fp, "dev %s ", ll_index_to_name(ifal->ifal_index)); 87 88 if (tb[IFAL_LABEL] && RTA_PAYLOAD(tb[IFAL_LABEL]) == sizeof(uint32_t)) { 89 uint32_t label; 90 memcpy(&label, RTA_DATA(tb[IFAL_LABEL]), sizeof(label)); 91 fprintf(fp, "label %u ", label); 92 } 93 94 fprintf(fp, "\n"); 95 fflush(fp); 96 return 0; 97 } 98 99 static int ipaddrlabel_list(int argc, char **argv) 100 { 101 int af = preferred_family; 102 103 if (af == AF_UNSPEC) 104 af = AF_INET6; 105 106 if (argc > 0) { 107 fprintf(stderr, "\"ip addrlabel show\" does not take any arguments.\n"); 108 return -1; 109 } 110 111 if (rtnl_wilddump_request(&rth, af, RTM_GETADDRLABEL) < 0) { 112 perror("Cannot send dump request"); 113 return 1; 114 } 115 116 if (rtnl_dump_filter(&rth, print_addrlabel, stdout) < 0) { 117 fprintf(stderr, "Dump terminated\n"); 118 return 1; 119 } 120 121 return 0; 122 } 123 124 125 static int ipaddrlabel_modify(int cmd, int argc, char **argv) 126 { 127 struct { 128 struct nlmsghdr n; 129 struct ifaddrlblmsg ifal; 130 char buf[1024]; 131 } req; 132 133 inet_prefix prefix; 134 uint32_t label = 0xffffffffUL; 135 char *p = NULL; 136 char *l = NULL; 137 138 memset(&req, 0, sizeof(req)); 139 memset(&prefix, 0, sizeof(prefix)); 140 141 req.n.nlmsg_type = cmd; 142 req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrlblmsg)); 143 req.n.nlmsg_flags = NLM_F_REQUEST; 144 req.ifal.ifal_family = preferred_family; 145 req.ifal.ifal_prefixlen = 0; 146 req.ifal.ifal_index = 0; 147 148 if (cmd == RTM_NEWADDRLABEL) { 149 req.n.nlmsg_flags |= NLM_F_CREATE|NLM_F_EXCL; 150 } 151 152 while (argc > 0) { 153 if (strcmp(*argv, "prefix") == 0) { 154 NEXT_ARG(); 155 p = *argv; 156 get_prefix(&prefix, *argv, preferred_family); 157 } else if (strcmp(*argv, "dev") == 0) { 158 NEXT_ARG(); 159 if ((req.ifal.ifal_index = ll_name_to_index(*argv)) == 0) 160 invarg("dev is invalid\n", *argv); 161 } else if (strcmp(*argv, "label") == 0) { 162 NEXT_ARG(); 163 l = *argv; 164 if (get_u32(&label, *argv, 0) || label == 0xffffffffUL) 165 invarg("label is invalid\n", *argv); 166 } 167 argc--; 168 argv++; 169 } 170 if (p == NULL) { 171 fprintf(stderr, "Not enough information: \"prefix\" argument is required.\n"); 172 return -1; 173 } 174 if (l == NULL) { 175 fprintf(stderr, "Not enough information: \"label\" argument is required.\n"); 176 return -1; 177 } 178 addattr32(&req.n, sizeof(req), IFAL_LABEL, label); 179 addattr_l(&req.n, sizeof(req), IFAL_ADDRESS, &prefix.data, prefix.bytelen); 180 req.ifal.ifal_prefixlen = prefix.bitlen; 181 182 if (req.ifal.ifal_family == AF_UNSPEC) 183 req.ifal.ifal_family = AF_INET6; 184 185 if (rtnl_talk(&rth, &req.n, NULL, 0) < 0) 186 return -2; 187 188 return 0; 189 } 190 191 192 static int flush_addrlabel(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg) 193 { 194 struct rtnl_handle rth2; 195 struct rtmsg *r = NLMSG_DATA(n); 196 int len = n->nlmsg_len; 197 struct rtattr * tb[IFAL_MAX+1]; 198 199 len -= NLMSG_LENGTH(sizeof(*r)); 200 if (len < 0) 201 return -1; 202 203 parse_rtattr(tb, IFAL_MAX, RTM_RTA(r), len); 204 205 if (tb[IFAL_ADDRESS]) { 206 n->nlmsg_type = RTM_DELADDRLABEL; 207 n->nlmsg_flags = NLM_F_REQUEST; 208 209 if (rtnl_open(&rth2, 0) < 0) 210 return -1; 211 212 if (rtnl_talk(&rth2, n, NULL, 0) < 0) 213 return -2; 214 215 rtnl_close(&rth2); 216 } 217 218 return 0; 219 } 220 221 static int ipaddrlabel_flush(int argc, char **argv) 222 { 223 int af = preferred_family; 224 225 if (af == AF_UNSPEC) 226 af = AF_INET6; 227 228 if (argc > 0) { 229 fprintf(stderr, "\"ip addrlabel flush\" does not allow extra arguments\n"); 230 return -1; 231 } 232 233 if (rtnl_wilddump_request(&rth, af, RTM_GETADDRLABEL) < 0) { 234 perror("Cannot send dump request"); 235 return -1; 236 } 237 238 if (rtnl_dump_filter(&rth, flush_addrlabel, NULL) < 0) { 239 fprintf(stderr, "Flush terminated\n"); 240 return -1; 241 } 242 243 return 0; 244 } 245 246 int do_ipaddrlabel(int argc, char **argv) 247 { 248 if (argc < 1) { 249 return ipaddrlabel_list(0, NULL); 250 } else if (matches(argv[0], "list") == 0 || 251 matches(argv[0], "lst") == 0 || 252 matches(argv[0], "show") == 0) { 253 return ipaddrlabel_list(argc-1, argv+1); 254 } else if (matches(argv[0], "add") == 0) { 255 return ipaddrlabel_modify(RTM_NEWADDRLABEL, argc-1, argv+1); 256 } else if (matches(argv[0], "delete") == 0) { 257 return ipaddrlabel_modify(RTM_DELADDRLABEL, argc-1, argv+1); 258 } else if (matches(argv[0], "flush") == 0) { 259 return ipaddrlabel_flush(argc-1, argv+1); 260 } else if (matches(argv[0], "help") == 0) 261 usage(); 262 263 fprintf(stderr, "Command \"%s\" is unknown, try \"ip addrlabel help\".\n", *argv); 264 exit(-1); 265 } 266
